<?php

namespace App\Text;

use App\Text\Text;
use App\Text\CreateTextDto;
use App\Text\TextRepository;

class JsonTextRepository implements TextRepository
{
    private string $filePath;

    public function __construct()
    {
        $this->filePath = __DIR__.'/../../data/texts.json';
    }

    public function create(CreateTextDto $dto): Text
    {
        $texts = $this->readTexts();
        $id = $this->getNextId($texts);

        $text = new Text(id: $id, name: $dto->name);
        $texts[] = ['id' => $id, 'name' => $dto->name];

        $this->writeTexts($texts);

        return $text;
    }

    public function find(int $id): ?Text
    {
        $texts = $this->readTexts();

        foreach ($texts as $data) {
            if ($data['id'] === $id) {
                return new Text(
                    id: $data['id'],
                    name: $data['name'],
                );
            }
        }

        return null;
    }

    /**
     * @return Text[]
     */
    public function getAll(): array
    {
        $texts = $this->readTexts();

        return array_map(
            function (array $data) {
                return new Text(
                    id: $data['id'],
                    name: $data['name'],
                );
            },
            $texts
        );
    }

    /**
     * @return array
     */
    private function readTexts(): array
    {
        if (!file_exists($this->filePath)) {
            return [];
        }

        $content = file_get_contents($this->filePath);

        return json_decode($content, true) ?? [];
    }

    /**
     * @param array $texts
     */
    private function writeTexts(array $texts): void
    {
        file_put_contents(
            $this->filePath,
            json_encode($texts, JSON_PRETTY_PRINT)
        );
    }

    /**
     * @param array $texts
     */
    private function getNextId(array $texts): int
    {
        if (empty($texts)) {
            return 1;
        }

        $maxId = 0;
        foreach ($texts as $text) {
            if ($text['id'] > $maxId) {
                $maxId = $text['id'];
            }
        }

        return $maxId + 1;
    }
}